Alright, let's solve this math problem step by step. First, we have the number 591. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 9. So, we're going to take the number 591 and add it to itself 9 times.
Step 1: 0 + 591 = 591
Step 2: 591 + 591 = 1182
Step 3: 1182 + 591 = 1773
Step 4: 1773 + 591 = 2364
Step 5: 2364 + 591 = 2955
Step 6: 2955 + 591 = 3546
Step 7: 3546 + 591 = 4137
Step 8: 4137 + 591 = 4728
Step 9: 4728 + 591 = 5319

So, 591*9 = 5319